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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 06-28-2008
BCRoamer BCRoamer is offline
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Default Primus Tip

We, like many others with Primus heating systems have the issue of the rather loud "jet engine" sound that some Primus system make when running. Several years ago we parked next to another '93 at the Bird's Nest over the Christmas Holidays; almost no noise from their coach. We compared notes and never came to a conclusion as to what the difference was.

A couple of years ago the pressure regulator for my Primus developed a leak (finding a new one is a another story); during a conversation with Mark Dexter (the guy who originally sold the Primus system in the USA) I mentioned the noise problem.

He told me that 99% of this issue was due to much LP pressure. If I remember correctly the Primus system is designed to run at 7.5 inches of water. At this setting the each boiler produces about 25k btu. By being sure the setting is 7.5" or slightly less the bothersome noise can be controlled.

When I replaced the regulator I put a small gauge in line, I started the boilers and turned the pressure down until the noise nearly stopped. That was at 7.2". I probably lower the output of my system slightly, but the noise level is now the same of lower than other heating systems.

On our coach the regulator is behind a panel which is behind the washout station. A whole bunch of screws to remove and you have to disconnect the shutoff handle, once your there there's a red cap (at least on ours) that unscrews and a slotted screw to adjust the pressure.

If you've got Primus and objectional noise give it a try.
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1993 WB #104663 (SOLD)
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  #2  
Old 06-29-2008
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Randy Dupree Randy Dupree is offline
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now thats good info!
its hard to think about heat when its 95 degrees out but i will look at that regulator sometime soon.
thanks for the tip!
Randy
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2000 LXI 43
Bainbridge,Ga.
Port St Joe Fl.
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  #3  
Old 06-30-2008
BCRoamer BCRoamer is offline
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Default Primus Regulator

Randy:

If I remember correctly the regulator is 0 to 10" of water and the setting is fairly senstive, so make your adjustments very small.
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  #4  
Old 06-30-2008
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Randy Dupree Randy Dupree is offline
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will do,my boilers would wake the dead!
Randy
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2000 LXI 43
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Port St Joe Fl.
www.buybyebluebird.com

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  #5  
Old 11-06-2008
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Juergen Juergen is offline
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Default primus heat

I am now firmly convinced that I must be cursed by iron oxide (nasty rust)
Fuel Tank, ZF tranny Oil Cooler, and now this.
One of my Primus boilers quit after it fired up , ran a few minutes, made a roaring noise and shut down. After a 1 1/2 years and reading all the Primus posts, I took the courage and dis assembled the bad boiler. I found this in the base plate. No wonder, the flame did not burn where it is supposed to burn, but burned every where else.
Now I am waiting for Mark Dexter about finding a new base. This rust is really something. Nobody else seems to be inundated with rust, so I guess I am it.
My second boiler runs OK, but I will yank that too and clean it as per Michael Brundridge. Thanks, Mike, you inspired me. Randy, (expert Blue-Bird man) have you ever seen a base like this??
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  #6  
Old 11-06-2008
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Randy Dupree Randy Dupree is offline
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no,i have never seen a rust prolem like that in a primus boiler.
but, a few years ago birtles was talking about having some primus bases made,so maybe he has.
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2000 LXI 43
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Port St Joe Fl.
www.buybyebluebird.com

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  #7  
Old 11-06-2008
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Juergen Juergen is offline
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Default primus heat

Randy
In your opinion, is it possible that Blue-Bird built just one coach in 1991 which catches rust everywhere so that it could be used as a guinie pig and study from it how to make rust free coaches??? If they did, I got the guinie pig. If you want to learn more about rust, and how to prevent it on coaches you sell, then I should try to get down and see you so you can study my coach.
I am still waiting for Dexter getting parts. Tomorrow the second boiler comes out and I'll have all winter to get them cleaned and working.

Oh yea, the color side of the disk goes on the short screw side, my picture shows the disk wrong side.
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  #8  
Old 11-06-2008
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Randy Dupree Randy Dupree is offline
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J,one thing i'm very sure of is that BB never built a coach that they wanted to rust.
reading your thread here reminds me of a bird rally about 10 years ago near crystal river Fl.
a freak storm blew in and about 10 coachs were flooded up to the floors,as high as the top of the wheels.
salt water from the gulf of mexico.
i never knew who owned those coachs,or what models they were.
i did wonder where they ended up.
does your coach show more signs of rust?
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2000 LXI 43
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Port St Joe Fl.
www.buybyebluebird.com

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  #9  
Old 11-07-2008
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Juergen Juergen is offline
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Default Rust and stuff

Randy
i know that my coach was not one of the 10 who got flooded. I had this coach since 1995 and I try to take the best of care for it. It only took most of my savings to buy it, so naturally I do all I can to keep it in good shape. Matter of fact I just had the front airbags replaced, all 4, they showed some cracking and I think 18 years is a Looong time for those bags. Rear ones look much better and they come next year. Working on my primus now. the second unit looks much better, rusty but still tight.
Oh yes there is another rust place. The top of the dining room window. see pix. You do like pictures I hope. I fixed that also 2 years ago. Its still holding.
First pix is DICOVERED RUST, RUBBER SEAL IS BULGING
Second Pix HOLDING PUTTY KNIFE TO SEE BOTTOM OF RUST
Third Pix CLEANED RUST + READY FOR POR 15 PAINT.
Water got in under the rubber strip and I noticed it too late. That water is sneaky. When I do make it to a RATS Rally, I'll be a rusty guy and I would love to look at other coaches of my age.
Thanks Randy
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  #10  
Old 11-08-2008
Stephen Stephen is offline
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I have 2 burners on order will know on monday whan they will arrive
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